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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86eae8f41039ffd49b5416b2889a24fbf7685ad6584671d729ab69a98c9a609e' 
  AND token = 'LKJ0xHCR0TkdMneVDivr32bkeA4bUvZ1swagNGU0Nvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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