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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05d59c58a5027d54ad507e113414e44ef852b0f8eecb3515c765d51d57f3e4e' 
  AND token = '5PAQX5kFOw89H6vCCOhpT+H7ZETnyH1bN6qRNyH7AOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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