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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af305005f5a597d9c1ca9924ac3daf508cbcdf4c6be0d3b6a76d37c99b35515' 
  AND token = '9JItsFXB4VI+tCE5VToo2RxPHlKspYx3hhzmDrs9804=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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