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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea94f1b7d6e00c86b5915834b66db88f50310a3c51bb33e819aab22e77ddae5' 
  AND token = '0o9RA4bJXP0reZNU77LJ1B7gdkWkfjjbB3+UouYYH4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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