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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0e0cd9bc40d2aeb3bf0ae38d58be94cdd57cba20c75a6c45f37476d096a144' 
  AND token = 'eYtL8JDnXCPllSG/A9293U7GphORF7xi1jx0JPOsQpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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