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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd308c809c5c2a9ff871b3693b44a07b1a860f079b4ea76adfaa30269ba671f55' 
  AND token = '9iueOpUUcKg8dpmabTrOoY3MW/uPpC1ito34nL1DX0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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