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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d66cc8641fce79b5c69d13a31caeb848ce0771a699b547972e8e8cc1f69604' 
  AND token = 'lXq2U6aEQ77HhxnwseyhXDt99TeKBV7Rislcj93ZWJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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