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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4ace25109488ee45b1ae3b704520656af82b771489f593bba59310a2cb1839' 
  AND token = '5sCcdniDLRo0ccw8v4ZQQizH80S1qBMVbA4q2ZmTL/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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