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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742d44c5e9a67bea3ebee030b04c951c177266794301ef0ce9fc93c3d145ffd2' 
  AND token = 'pKzJGzoUjUpbSNjNqN+UEdw/Y7elbN6WzTfp6Xi7uHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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