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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b2b4be14e3c4c33f5bbe3980300835028b6367e8250794cadbaede4390259b' 
  AND token = 'x+cJGElOz22v+CyPOfvM1osFyLs/yDMLW0V8v/LYYzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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