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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50687e35c2d3d7f7e2a092c63d04a21d96fd994f8c652bcd7ec33106a68522e0' 
  AND token = 'XhKHlVlYxXzDQbWXQFZ22Au6cxpEyicY0Jibvx7yxis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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