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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d52f7b672d592be854fc7e454df069e0567a05615d3418dcc56ff52256a90d' 
  AND token = 'Smur5K+a3bw5BZl33y/0ya2c/MB5i2eg/h8UkN8TseI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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