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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415593c690de47d8cc0ed4a82e85a3e68d4157ed7ff22e7066c16e08d1beb701' 
  AND token = 'BvamiQqc124rXHTaFe9h6dNv/aNe7gR8jXzsyBwGOmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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