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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8499471a97915ee039452a06a1ab8b4a06ffe26ac7ac1c2bbb72573550b213a' 
  AND token = 'tqwSng99X+WqAVvPcRuH+uDM5yyB6Sop3H8aVuK9ylY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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