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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4f39dce4a84c52a922d311f12bce74ada14462ba216436f5372838fd51eb56' 
  AND token = 'MgL4jOUY8vgsFL1ItkPlO+i0iqPH1frl6KAhz7lpFN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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