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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0c6acd6f1747fc36de5a395591f95685e2d764c6db69891b8ae1ee33fd51bf' 
  AND token = 'mN7YjPJxrJB9xRrCxJkasxmcFPBgryUg30daLvEN+x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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