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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5143de3aa3a10c4661c8b0da0aaadc075f4b247e1b630b7f012d24c98124bc' 
  AND token = 'PCf3eTiB/6In9HJffaepQekwlO6akUj7MmzxTNacA+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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