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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48c365544d896f973cf6d5851b29d9a95d67627664a232cb6748e892fa80b93' 
  AND token = 'rd5dCQGErwLp8kOdgwVVWQRgTcZGBIuGdCjeOAqC6h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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