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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31332ffadcab1834b85287ed058c08dc5276e0b70cef3608572e3f9f88f1e784' 
  AND token = 'kG3lffuxBeXcRrnQBR4pO+vD+V/Gl0yOG/Dd3BWDrwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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