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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c12c2af54f27ed0c202e007b6c953a3913b0e9365446ef09bd6ddf6c6d6f33' 
  AND token = 'YRI3wWR/hawDeTvC+3C6aOjKJui7OaJrETA/ThGrAU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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