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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb7a81b77cf72cd0e7c34f896eeb5500e28e91fed7ff79e6ec36660fdd7c698' 
  AND token = 'Jzl/TKT4UUqYvXPFgY6LCmwLbeUuYnV0AEc4l5NE2oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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