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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b941166a5f280b28a43e3f3651589c1df2695ba67c7a5bd053989fa32c315451' 
  AND token = '0ZKaNkB9qTq7t2N6CsWCOq+DrXuqhILzy9xao4GUYWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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