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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eea91cca70289d5802bb8851dc96bfc6ca50186c9dc335e57dce9dc3eb3c5aa' 
  AND token = 'vM8ircdA17szAAf17GtJDazzMpxZmF04Vhjd2Bt/oW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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