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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfaaaffdc13fc77806f391f9c9d0931454fbc48c20d562c6ae3ab2fad7ae3d2' 
  AND token = 'XE8rQ6bwW18d71Ycs9BXCJHyFtVY4NsfxOZ9RslrJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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