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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d36a3d39a7d39b32eba2b603039c3278c521a0342f85e0d88e553911abfa82' 
  AND token = '/aqegKGjC3WpHsia+mgrTylWn3mvZcePV+Yk/t9mEoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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