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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dd5e2818c09a770f4e1714d6530c6220bfaa3bbec20e1b10019a70869660ed' 
  AND token = 'il1hu/wf1htbWfAHy/JTH+FZgrjbKj6r4fQmZa2Z+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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