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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbc8a1aa91a1a34b41c866efe9a9d69d7df37de2aca44f4cbfe5cf17cddc6c2' 
  AND token = 'ZlSETLC8T339BBQ2ubxfPR/cDtBc9Tsq6iN6wwQ1QIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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