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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef4791bf440e4c26b46a495297889a5c45ae831e457fdc7b78511dc33242f64' 
  AND token = '4CZjflZS0z8dWJqjAdtGeCettb/Jx5Z5BzkBppSwQYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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