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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c44614bde85e114273118a985d9d3855191ff4598b397075db24e987de3d9a' 
  AND token = 'H3YtM4iUpR1YJZpAgVu++Gq/Oik+YDOyjg6FOEO+ePo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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