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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a82d1ea8ed309bdaefb2587a5a42a38e1e08790497bbb0e742bb61460372c4' 
  AND token = 'RYMbgHPxupKIPu7fSVqZY3ahoUGikYRvx4zE0t3iwxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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