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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb4de41998f59b46701ef2ae28516d3ef2ffa6aeaee1f2f6d5fdfeb1dabe458' 
  AND token = 'm6gnT4H7kecuhcwHhIV2yI67CJf/BmrtNrRF1W5A5yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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