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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d23933012f493da1e0692b749daf872cac80dc8ee15083e9b3aed6dacd17a59' 
  AND token = 'vI9zSLQ318hTF8p84gx2H27M7hWOS8wlYkfpjPaJw2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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