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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fb2919d6f252f223e547c53a42b96fa47932e64327a5e95af67f9c5d825694' 
  AND token = 'DRysRb4Hcd/kIOdIMc2rfzh8KglEUCr2T8xqEiMA9bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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