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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ce40ab7d2a02493f2501f75ebecdbe37342d675b8d446536f441f0e41de9f4' 
  AND token = 'Lghg4OrnSEz45lu3dnNiO6l/kLNSUfCtQHASV6hlNFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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