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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee7e7197ff0378f5c067b1446e932ad748bd4d509f37dc0bd14b1861490f78c' 
  AND token = 'WClijD3ixgeTZwPtj302mXFsRWv85jNQzO1zdO/KZEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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