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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ed5b89938e11f699c7b055829d73c181e901d110839ca0252ec0e1c8b6a901' 
  AND token = 'FRLk+DxXs4YjwYxbN6IDFYUso1NK8Qjuttyk9RR8Jhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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