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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17754d15c98133808cae8349375ecc92b53ac6f98bf98e30d642225523e266a' 
  AND token = 'xR95xqcQ0oMjzKEIi7CyfFrM27ETAggAXDJ92e1+KGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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