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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2652784c90b07889b8aacabb6c53586415b69d2ed581d80bdf697925f5f9ed50' 
  AND token = '8witvutwr6pHOqlI+oB0l0XzknBAvHsYk/RR8fLvkUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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