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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66920a218916cab3d0fbc6e8be7ec7ccc65f3fdf38be02c64484e3d44079a16b' 
  AND token = '699AyFrdnDUx1RJRKWLLzXoMmW8+4jMITGIuHDJlOHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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