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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65079d56b8015261b1104a46f57157e6dd8b632ca9620f58f9193a1e77e08b0' 
  AND token = '28xmF4c96T35wRiwtuMOjqffxy/7+jHcnGo/6L4wZHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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