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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2403d4134f6f34de3a4c9f85fbf0aa398d3a2508d469eaa0ba879e11f452302c' 
  AND token = '438Aarv7oOi4X3Ewri0dNJyACPu3OIwDulZQXTw1r4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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