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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab29016c692d5191a040a89565427ac74fa6e1d3a10466bc23e943425b9aafba' 
  AND token = 'AB9vKYDNN0EAIu9ysW0v6pTeel8FQE15j8wXbAOClS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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