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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e139c62661339ae2beeeaaa4e740782a8063afa566bb201b72a1e3cfe6fb3266' 
  AND token = '006T7JK3UNUCPqKSAimT0ugF2h6AXXwv2v1cTQONfMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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