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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc36556312702b1d3a58e8b91db885fa1f4be6c5a9cf2b1a4d9fc4df986a5aba' 
  AND token = 'r7qWjzyymgmpHnLMzNKtcduFStBzihn9PxkS6Vzx7SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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