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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444bdc0d24f769a5ee8e90865d2456b8ecc70cd1979fa3a5750fbc59fe113911' 
  AND token = 'MAkdBfYpF4CBuNow/nTq3k3hXtqObpDE70KE94nUrfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}