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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6aafd0a6a6d8ca2d3ffb436032f9b64fac36f305f9084fe77ee54015cab808' 
  AND token = 'eMpq5xNfUtd6uf/azKzaWZwv4KYQjPjnZu4ADDm8XJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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