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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c7fc8262f8a10a984275cd4b2d9478e891f9a442d3e9c4e9d9e47d753e21ae' 
  AND token = '8x3PybpHt9cvKNWkO/3urXj69qgA83QuN//YspunwCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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