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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6c36b40007f7658c41f1c601a38132cb5995c4e56e94c3adcc695f310c2c38' 
  AND token = 'zVlrkoB5QNb5togxchBcf2yDqy/ockBeY1Ppc713yOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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