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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbdb3933d4da8311f510fa4a7c903b8052c87f0a3ed65b5e3d7064b851258e9' 
  AND token = 'Dfx3umXCxwlltw9FktsV78Mo4CbBUH9YE4s/kDY5Sbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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