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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b92b0b9d59bf071f2a16a61b2cad6bc363a1d863c9d63ff7e0252944e70f4d' 
  AND token = 'J6ECumDMxvrF/9cvvXncL/hme45Nf240Q5QJ4gZtTaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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