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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941c87a89b6b70e767d9bc1fcadaed8aff66495b7b1dde94f7d705d1a0b53e76' 
  AND token = '5Faga9CEaVG/yIKlWJna2xJ6CgCuTjw9YgZVBPyrkTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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