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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd0545006e1f0584ac8e85a7dc0aae41236004aa8cf7ff96964b9dcfdbd32ad' 
  AND token = 'AHSoHEhC3DJ+QtgBUrSktluLe+iAhD4+/zIipP6KtHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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