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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b80e67a8394fd60bfa88b66728e99b784a6f45c591987d5a1aa5ba14501c5e' 
  AND token = 'gIM6CpSRHyJh6llPAUiXwNQGBdJtm7ecBLbt9j8pv9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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