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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe36d32938dfa1f8918ffc4ea3170c8cb0437eeab7e85d7e5dab6630691c9a42' 
  AND token = 'knTYvVece6ZLA1j1Nkq8enuPGkHCYBQ+G3B7g1BWFfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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