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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390f6b8883e0ed4c1728704ce01fd0618ab26c95c9d9863b28e758c2cb9f97ee' 
  AND token = 'mBm+FlmKBvqQhOp73NdArlaQUyO5EJIMuQhqLD4bdO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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