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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052966d4c7d9099ace91be157a33d1a293fa0dbf797840e69078699e449147c7' 
  AND token = 'OqnngNqJ5vD2et9eKoz2NGCnFA9BwXsN0G12LWCD83k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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