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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dc21f32eaeacef00db48dc935426fb5124c25661aa67a7905e15223cf99e78' 
  AND token = 'TAse1E9rgFWRV6eoZUmN1KMF3V2oM7KM2AlK6AUs/bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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