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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b44d01d63b9ded996083cb028fbab12d7a79a0c8d2cbc20fc81701b464e31b' 
  AND token = '6F/X9Mf5ua9wyxWFHP9O6/DhWdO8En4h21+EXWvxKrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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