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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504f01e5e33ead6f9e795156d7a55bf0a8b08d15975fb6f8dd843ccf18a4c055' 
  AND token = 'DV90TBIWVgyrh1Fw/YGYeUFIuY68Dzoz5ALGlIXP4O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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