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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8506a3eae49c3d39a7cac56123c795cee22002f85ae144c88d181a7a7261f0' 
  AND token = 'X2WIlCuCA6AI3slHvA83E10FOsjgzcmesq5j2vHMfug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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